contrib/openpam/lib/openpam_set_option.c

   1 /*-
   2  * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
   3  * All rights reserved.
   4  *
   5  * This software was developed for the FreeBSD Project by ThinkSec AS and
   6  * Network Associates Laboratories, the Security Research Division of
   7  * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
   8  * ("CBOSS"), as part of the DARPA CHATS research program.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote
  19  *    products derived from this software without specific prior written
  20  *    permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $P4: //depot/projects/openpam/lib/openpam_set_option.c#13 $
  35  */
  36
  37 #include <sys/param.h>
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42
  43 #include <security/pam_appl.h>
  44 #include <security/openpam.h>
  45
  46 #include "openpam_impl.h"
  47
  48 /*
  49  * OpenPAM extension
  50  *
  51  * Sets the value of a module option
  52  */
  53
  54 int
  55 openpam_set_option(pam_handle_t *pamh,
  56         const char *option,
  57         const char *value)
  58 {
  59         pam_chain_t *cur;
  60         char *opt, **optv;
  61         size_t len;
  62         int i;
  63
  64         ENTERS(option);
  65         if (pamh == NULL || pamh->current == NULL || option == NULL)
  66                 RETURNC(PAM_SYSTEM_ERR);
  67         cur = pamh->current;
  68         for (len = 0; option[len] != '\0'; ++len)
  69                 if (option[len] == '=')
  70                         break;
  71         for (i = 0; i < cur->optc; ++i) {
  72                 if (strncmp(cur->optv[i], option, len) == 0 &&
  73                     (cur->optv[i][len] == '\0' || cur->optv[i][len] == '='))
  74                         break;
  75         }
  76         if (value == NULL) {
  77                 /* remove */
  78                 if (i == cur->optc)
  79                         RETURNC(PAM_SUCCESS);
  80                 for (free(cur->optv[i]); i < cur->optc; ++i)
  81                         cur->optv[i] = cur->optv[i + 1];
  82                 cur->optv[i] = NULL;
  83                 RETURNC(PAM_SUCCESS);
  84         }
  85         if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0)
  86                 RETURNC(PAM_BUF_ERR);
  87         if (i == cur->optc) {
  88                 /* add */
  89                 optv = realloc(cur->optv, sizeof(char *) * (cur->optc + 2));
  90                 if (optv == NULL) {
  91                         FREE(opt);
  92                         RETURNC(PAM_BUF_ERR);
  93                 }
  94                 optv[i] = opt;
  95                 optv[i + 1] = NULL;
  96                 cur->optv = optv;
  97                 ++cur->optc;
  98         } else {
  99                 /* replace */
 100                 FREE(cur->optv[i]);
 101                 cur->optv[i] = opt;
 102         }
 103         RETURNC(PAM_SUCCESS);
 104 }
 105
 106 /*
 107  * Error codes:
 108  *
 109  *      PAM_SYSTEM_ERR
 110  *      PAM_BUF_ERR
 111  */
 112
 113 /**
 114  * The =openpam_set_option function sets the specified option in the
 115  * context of the currently executing service module.
 116  *
 117  * >openpam_get_option
 118  */